There has been some question on whether or not Supergirl, the Melissa Benoist series, would be renewed for a second season. Its US network, CBS, made no secrets of its disappointment with ratings compared to the high per episode production cost. But a reprieve has come in the form of the CW, American homebase for Arrow, The Flash and DC's Legends Of Tomorrow, which has picked the show up.
As to the physical make-up of the series, it will be interesting to see what impact the shifting of networks has considering that the CW does not fund to the same extent that CBS does. Unknown is whether or not the entire cast will make the network jump along with Benoist due to potential fiscal issues.
Already there's been talk of production making a cost-cutting move to Vancouver, where the other DC series are shot by their producer, Greg Berlanti. This past season Grant Gustin's The Flash crossed over to Supergirl pretty seamlessly, so from a creative point of view this would seem to open up many more avenues for the Girl Of Steel to interact with other characters from the DC universe.
The first year was broadcast on Sky1 in the UK.